Ship scr system

A technology of SCR system and marine engine, which is applied in the field of SCR system, can solve the problems of reduced conversion efficiency, uneven distribution, increased ammonia leakage, etc., and achieve the effect of increasing the contact area and uniform mixing

Inactive Publication Date: 2016-08-17
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Due to the large diameter of the exhaust pipe of the marine engine, the airflow discharged from the exhaust pipe is an irregularly moving airflow. This irregularly moving airflow easily makes the distribution of Tianlan (40% mass concentration urea aqueous solution) uneven in the airflow , resulting in Tianlan not being able to fully contact the catalyst in the catalytic converter, eventually leading to NO x Reduced conversion efficiency and increased ammonia slip

Method used

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Embodiment Construction

[0045] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0046] Such as figure 1 A marine engine SCR system shown includes an engine exhaust pipe 1, a blue injection system 2 and a catalytic converter 3, the exhaust port of the engine exhaust pipe 1 communicates with the intake port of the catalytic converter 3, The nozzle 2a of the Tianlan injection system 2 is arranged in the engine exhaust pipe 1, and a mixer 4 is arranged between the engine exhaust pipe 1 and the catalytic converter 3, and the mixer 4 includes a cylindrical Structure of the mixer tube body 4a and the vane assembly 4b fixedly installed in the mixer tube body 4a;

[0047] The blade assembly 4b includes a central circular boss 4b1 and blade assemblies 4b2 uniformly arranged along the circumferential direction of the outer edge of the central circular boss 4b1;

[0048] The blade assembly 4b2 further includes a straight blade 4b2a a...

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Abstract

The invention discloses an SCR system of a ship engine. The SCR system of the ship engine comprises an engine exhaust pipe, an adblue spraying system and a catalyst. An exhaust port of the engine exhaust pipe is communicated with a gas inlet of the catalyst. A nozzle of the adblue spraying system is arranged in the engine exhaust pipe. A mixer is arranged between the engine exhaust pipe and the catalyst. The mixer comprises a mixer pipe body of a cylindrical structure and a blade assembly fixedly installed in the mixer pipe body. The blade assembly comprises a central round boss and blade components which are evenly arranged along the outer edge of the central round boss in the circumferential direction. Each blade component comprises a straight blade and a bent blade, wherein one side edge of the straight blade is connected with one side edge of the bent blade to form the blade component, one end of the blade component is connected with the outer edge of the central round boss, the included angle between the plane where the straight blade is located and the plane where the central round boss is located is alpha, and the included angle between the plane where the bent blade is located and the plane where the straight blade is located is beta. The SCR system of the ship engine is suitable for a ship.

Description

technical field [0001] The invention relates to an SCR system for a marine diesel engine, in particular to a marine engine SCR system. Background technique [0002] Nitrogen oxides are one of the main harmful emissions from marine diesel engines. Nitrogen oxides are commonly referred to as N 2 O, NO, NO 2 , N 2 o 3 , N 2 o 4 and N 2 o 5 and other different forms, among which the largest proportion is NO and NO 2 , are all important air pollutants (unless otherwise specified, the nitrogen oxides mentioned below——NO x Refers only to NO and NO 2 ). [0003] According to the statistics of China Classification Society, as of 2010, the CCS (CCS is the abbreviation of China Classification Society) class fleet has a total of 2,485 classed ships, with a total of 42.78 million tons. x The emission level is about 15g / (kWh), and the fuel consumption rate is about 190g / (kWh). If it runs for 4000 hours a year, the annual fuel oil consumption will exceed 12 million tons, and the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/28
Inventor 吕林陈悦
Owner WUHAN UNIV OF TECH
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